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San Francisco Volcanic Field
The San Francisco volcanic field is an area of volcanoes in northern Arizona, north of Flagstaff, US. The field covers 1,800 square miles (4,700 km²) of the southern boundary of the Colorado Plateau. The field contains 600 volcanoes ranging in age from nearly 6 million years old to less than 1,000 years (Miocene to Holocene), of which Sunset Crater is the youngest. The highest peak in the field is Humphreys Peak, at Flagstaff's northern perimeter: the peak is Arizona's highest at 12,633 feet (3,851 m) and is a part of the San Francisco Peaks, an active stratovolcano complex. Description This volcanic field seems to have formed from a geological hotspot. As the North American Plate moves over the spot, new volcanoes appear. Thus, the newest volcanoes are at the east side of the field. Most of the volcanoes are basalt cinder cones, but there are also large lava domes consisting of rhyolite and dacite. Given that Sunset Crater is such a young volcanic feature of this area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava Dome
In volcanology, a lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions on Earth are lava dome forming. The geochemistry of lava domes can vary from basalt (e.g. Semeru, 1946) to rhyolite (e.g. Chaiten, 2010) although the majority are of intermediate composition (such as Santiaguito, dacite-andesite, present day) The characteristic dome shape is attributed to high viscosity that prevents the lava from flowing very far. This high viscosity can be obtained in two ways: by high levels of silica in the magma, or by degassing of fluid magma. Since viscous basaltic and andesitic domes weather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite. Existence of lava domes has been suggested for some domed structures on the Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colton Crater (Crater 160)
Colton may refer to: Places Australia * Colton, South Australia, a locality in the District Council of Elliston * Electoral district of Colton, South Australia England * Colton, Cumbria * Colton, Leeds (a village to the east of the city.) * Colton, Norfolk (in Marlingford and Colton parish) * Colton, North Yorkshire * Colton, Staffordshire * Colton, Suffolk (in Great Barton parish) United States * Colton, California * Colton, Nebraska * Colton, New York ** Colton (CDP), New York * Colton, Ohio * Colton, Oregon * Colton, South Dakota * Colton, Utah, a ghost town * Colton, Washington * Colton Crater, Coconino County, Arizona * Colton Hall California's Constitution Hall in Monterey People with the name * Colton (given name) * Colton (surname) Other uses * Colton antigen system * Marr and Colton The Marr & Colton Company was a producer of theater pipe organs, located in Warsaw, New York. The firm was founded by David Jackson Marr and John J. Colton. The company bui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by Henry VIII of England, King Henry VIII in 1534, it is the oldest university press A university press is an academic publishing house specializing in monographs and scholarly journals. Most are nonprofit organizations and an integral component of a large research university. They publish work that has been reviewed by schola ... in the world. It is also the King's Printer. Cambridge University Press is a department of the University of Cambridge and is both an academic and educational publisher. It became part of Cambridge University Press & Assessment, following a merger with Cambridge Assessment in 2021. With a global sales presence, publishing hubs, and offices in more than 40 Country, countries, it publishes over 50,000 titles by authors from over 100 countries. Its publishing includes more than 380 academic journals, monographs, reference works, school and uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bill Williams Mountain
Bill Williams Mountain is a peak and lava dome volcano located about west of Flagstaff and south of Williams, Arizona in the Kaibab National Forest. It is named for Old Bill Williams, a scout, guide, and mountain man, who lived in the 1800s. It is part of the San Francisco volcanic field The San Francisco volcanic field is an area of volcanoes in northern Arizona, north of Flagstaff, US. The field covers 1,800 square miles (4,700 km²) of the southern boundary of the Colorado Plateau. The field contains 600 volcanoes rang .... References External links * {{Authority control Landforms of Coconino County, Arizona Volcanoes of Arizona Protected areas of Coconino County, Arizona Kaibab National Forest Mountains of Coconino County, Arizona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geographic Coordinates
The geographic coordinate system (GCS) is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a coordinate tuple like a cartesian coordinate system, the geographic coordinate system is not cartesian because the measurements are angles and are not on a planar surface. A full GCS specification, such as those listed in the EPSG and ISO 19111 standards, also includes a choice of geodetic datum (including an Earth ellipsoid), as different datums will yield different latitude and longitude values for the same location. History The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene, who composed his now-lost ''Geography'' at the Library of Alexandria in the 3rd century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Point Lava Flow, Arizona
Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have often been used to describe opposites such as good and evil, the Dark Ages versus Age of Enlightenment, and night versus day. Since the Middle Ages, black has been the symbolic color of solemnity and authority, and for this reason it is still commonly worn by judges and magistrates. Black was one of the first colors used by artists in Neolithic cave paintings. It was used in ancient Egypt and Greece as the color of the underworld. In the Roman Empire, it became the color of mourning, and over the centuries it was frequently associated with death, evil, witches, and magic. In the 14th century, it was worn by royalty, clergy, judges, and government officials in much of Europe. It became the color worn by English romantic poets, businessme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Research And Technology Studies
NASA's Desert Research and Technology Studies (Desert RATS or D-RATS) is a group of teams which perform an annual series of field trials seeking to demonstrate and test candidate technologies and systems for human exploration of the surface of the Moon, Mars, or other rocky bodies. Desert RATS began in 1997, reviving Apollo-style lunar exploration training from decades earlier. The field season takes place for around two weeks each year, usually in September, in planned locations surrounding Flagstaff, Arizona. Some tests have also been conducted near Meteor Crater. These activities are designed to exercise prototype planetary surface hardware and representative mission scenario operations in relatively harsh climatic conditions where long distance, multi-day traversing activities are achievable. Participants The participants in Desert RATS vary from year to year. Past participants have included researchers from various NASA centers, including Johnson Space Center, Kennedy Spa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics (NACA), to give the U.S. space development effort a distinctly civilian orientation, emphasizing peaceful applications in space science. NASA has since led most American space exploration, including Project Mercury, Project Gemini, the 1968-1972 Apollo Moon landing missions, the Skylab space station, and the Space Shuttle. NASA supports the International Space Station and oversees the development of the Orion spacecraft and the Space Launch System for the crewed lunar Artemis program, Commercial Crew spacecraft, and the planned Lunar Gateway space station. The agency is also responsible for the Launch Services Program, which provides oversight of launch operations and countdown management f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ʻaʻā
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is also often called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word ''lava'' comes from Italian and is probably derived from the Latin word ''labes'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kendrick Mountain Wilderness
Kendrick Mountain Wilderness is a wilderness area in the U.S. State of Arizona. It lies north of the city of Flagstaff on the Coconino Plateau in Coconino County. Kendrick Mountain Wilderness was designated a protected Wilderness area by Congress in 1984. About two thirds of the wilderness is contained within the Kaibab National Forest. Kendrick Mountain Wilderness contains Kendrick Peak, upon which a fire lookout has been located since the early 1900s. In the year 2000 the Kendrick Wilderness and Kendrick Peak were substantially affected by a 15,000 acre (61 km2) wildfire, known as the "Pumpkin Fire", the results of which are still quite evident to hikers or visitors to the peak. In an effort to return the forest to its "pre-fire" state, cattle are sometimes grazed near the Kendrick Mountain Trail trailhead. See also * List of U.S. Wilderness Areas * List of Arizona Wilderness Areas The National Wilderness Preservation System includes 803 wilderness areas protecti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SP Crater
S P Crater is a cinder cone volcano in the San Francisco volcanic field, north of Flagstaff, Arizona, United States. It is surrounded by several other cinder cones which are older and more eroded. It is a striking feature on the local landscape, with a well-defined lava flow that extends for to the north. American astronauts use the crater to train for moonwalking. Name The naming of the mountain is a bit of lore from the Old West. S P Crater can be climbed, and the lava flow can be viewed from the crater rim. C. J. Babbit, an 1880s rancher and early landowner of the mountain, expressed his opinion that the mountain resembled a spilled chamber pot (or Shit Pot, "SP"), and locally this became the accepted name. When viewed from certain angles on the ground, the combination of the smooth round shape of the cone, the dark lava spatter on the rim, and the long dark lava flow extruding from the base may resemble human waste. Mapmakers refused to spell out the full name, and the mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
